import java.util.HashSet;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNextLine()) { // 注意 while 处理多个 case
            String str1 = in.nextLine();
            String str2 = in.nextLine();
            func(str1, str2);
        }
    }

    public static void func(String str1, String str2) {
        HashSet<Character> set1 = new HashSet<>();
        HashSet<Character> set2 = new HashSet<>();

        for (char ch : str2.toUpperCase().toCharArray()) {
            set1.add(ch);
        }

        for (char ch : str1.toUpperCase().toCharArray()) {
            if (!set1.contains(ch) && !set2.contains(ch)) {
                System.out.print(ch);
                set2.add(ch);
            }
        }
    }
}